What can my 370 hold? - LS1TECH

Log In 


Forced Induction Superchargers | Turbochargers | Intercoolers
Sponsored by:
Sponsored by:

What can my 370 hold?

Reply
 
Thread Tools Search this Thread
Old 11-30-2006, 10:12 PM   #1
TECH Fanatic
Thread Starter
iTrader: (16)
 
HydroStream6's Avatar
 
Join Date: Nov 2004
Location: Rochester, NY
Posts: 1,217
Default What can my 370 hold?

Well in the neverending quest for more power, I'm starting to think of what I'll need to upgrade in the offseason on my engine. I have a iron block 370 (stock stroke, 4.03" bore) with the following:

Diamond 11515 pistons (-15cc), ProSelect rings
Scat 4340 H beam forged rods
Stock LS1 crank
LS6 cam
241 heads with stock sized valves... cleaned up a little, nothing special
GM MLS 6L gaskets
ARP head bolts

I know ARP studs are definitly a good idea at this point. I'm not postive where my CR is at this point... Diamonds site lists 9.4:1 with 66cc heads, I'm not positive how the cam affects that. Anyways. as built, how much power, assuming optimal tuning, good gas, etc, can this engine hold? I'm right around 600rwhp right now and I have nitrous that I've yet to spray also.

Thanks
Adam
HydroStream6 is offline   Reply With Quote
Old 11-30-2006, 10:17 PM   #2
TECH Fanatic
iTrader: (8)
 
SSilverSSurfer's Avatar
 
Join Date: Jul 2004
Location: College Station/Pasadena
Posts: 8,185
Default

more than the 600hp you have now plus nitrous
SSilverSSurfer is offline   Reply With Quote
Old 11-30-2006, 10:24 PM   #3
10 Second Club
iTrader: (38)
 
Mr_president's Avatar
 
Join Date: Jan 2005
Location: Fresno, CA
Posts: 1,409
Default

1200 or so at the motor my guess....900 to the tires
Mr_president is offline   Reply With Quote
Old 12-01-2006, 01:22 PM   #4
TECH Veteran
iTrader: (1)
 
vanillagorilla's Avatar
 
Join Date: Apr 2004
Location: Arizona Bay
Posts: 4,038
Default

TTT, I'm fixing to build a motor similar to this and I'd like to know too.
vanillagorilla is offline   Reply With Quote
Old 12-02-2006, 03:33 PM   #5
TECH Enthusiast
 
Drewstein's Avatar
 
Join Date: Dec 2005
Location: Scottsdale, AZ
Posts: 543
Default

Quote:
Originally Posted by Mr_president
1200 or so at the motor my guess....900 to the tires
/agree
Drewstein is offline   Reply With Quote
Old 12-02-2006, 03:46 PM   #6
TECH Fanatic
iTrader: (6)
 
Join Date: Dec 2001
Location: LV NV
Posts: 1,119
Default

if you balance it just right ............and extra large pep and saus pizza and two liter. lol

I couldnt resist. now back on topic.
1320 is offline   Reply With Quote
Old 12-02-2006, 04:51 PM   #7
TECH Senior Member
iTrader: (21)
 
NA$TY-TA's Avatar
 
Join Date: Aug 2002
Location: San Antonio, TX
Posts: 10,348
Default

Plenty...... with a good tune..... id lower the comp some with some 72cc chmabered heads...... Some worked 6.0L's would work well and drop you to where i am... about 8.87:1

Kyle
NA$TY-TA is offline   Reply With Quote
Old 12-02-2006, 08:31 PM   #8
TECH Resident
iTrader: (4)
 
BIG BAD BLACKSS's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 983
Default

I have pretty much that same combo, my shortblock came from speed inc, 6.0 iron block, -14.9cc diamond pistons, with diamond pro-select rings, but i have eagle 4340 rods with the L-19 bolts added, and a stock crank, studded bottomend, im planning on running a 72CC truck head with the GM MLS gaskets and im looking at 9.2 or 9.3:1 compression. This is the same shortblock speed inc takes into the 8s and puts down 995RWHP with. Except i added the upgraded L-19 bolts, they said they run the bolts that normally come with the eagle h beams in their motor and not L-19s like i upgraded to. Otherwise im identical to their shortblock.
BIG BAD BLACKSS is offline   Reply With Quote
Old 12-02-2006, 09:06 PM   #9
TECH Senior Member
iTrader: (21)
 
NA$TY-TA's Avatar
 
Join Date: Aug 2002
Location: San Antonio, TX
Posts: 10,348
Default

Quote:
Originally Posted by BIG BAD BLACKSS
I have pretty much that same combo, my shortblock came from speed inc, 6.0 iron block, -14.9cc diamond pistons, with diamond pro-select rings, but i have eagle 4340 rods with the L-19 bolts added, and a stock crank, studded bottomend, im planning on running a 72CC truck head with the GM MLS gaskets and im looking at 9.2 or 9.3:1 compression. This is the same shortblock speed inc takes into the 8s and puts down 995RWHP with. Except i added the upgraded L-19 bolts, they said they run the bolts that normally come with the eagle h beams in their motor and not L-19s like i upgraded to. Otherwise im identical to their shortblock.


See thats what i have and who ever did your math for u for your compression is missing something........ 4.03" Bore, 3.622" stroke, -15cc dish piston 72cc chamber head, .054 head gasket crush thickness.....
I get 8.7:1 out of most online calculators.....
NA$TY-TA is offline   Reply With Quote
Old 12-02-2006, 10:22 PM   #10
TECH Resident
iTrader: (4)
 
BIG BAD BLACKSS's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 983
Default

This was posted by tom from speed inc.

"Those are the correct pistons for your target compression ratio.

Enter Cylinder Bore Size 4.030
Enter Piston Stroke Length 3.622
Enter Head Gasket Bore Diameter 4.030
Enter Compressed Head Gasket Thickness .058
Enter Combustion Chamber Volume In CCs 72
Enter Piston Dome Volume In CCs Negative For Dished Pistons (Use '-') -15
Enter Piston Deck Clearance Negative If ABOVE Deck (Use '-') : 0

Calculated Engine Compression Ratio 9.194284170932075
Total Displacement Volume 92.39288038220492

Go to http://www.csgnetwork.com/compcalc.html if you want to verify for yourself.

This is the exact combo we use in ALL of our 370" Boost motors, including our 995 RWHP shop car turbo combo. WE run this exact spec short block, with AFR 72cc 225's, and the GM 6.0 MLS head gaskets."

POST #11
http://www.ls1tech.com/forums/showthread.php?t=590175

EDIT: Just plugged in the #s myself and im coming up with 8.637878924666251! Im gonna go nuts before i get this all together and running!

Last edited by BIG BAD BLACKSS; 12-02-2006 at 10:39 PM.
BIG BAD BLACKSS is offline   Reply With Quote
Old 12-03-2006, 08:40 AM   #11
TECH Senior Member
iTrader: (21)
 
NA$TY-TA's Avatar
 
Join Date: Aug 2002
Location: San Antonio, TX
Posts: 10,348
Default

Quote:
Originally Posted by BIG BAD BLACKSS
This was posted by tom from speed inc.

"Those are the correct pistons for your target compression ratio.

Enter Cylinder Bore Size 4.030
Enter Piston Stroke Length 3.622
Enter Head Gasket Bore Diameter 4.030
Enter Compressed Head Gasket Thickness .058
Enter Combustion Chamber Volume In CCs 72
Enter Piston Dome Volume In CCs Negative For Dished Pistons (Use '-') -15
Enter Piston Deck Clearance Negative If ABOVE Deck (Use '-') : 0

Calculated Engine Compression Ratio 9.194284170932075
Total Displacement Volume 92.39288038220492

Go to http://www.csgnetwork.com/compcalc.html if you want to verify for yourself.

This is the exact combo we use in ALL of our 370" Boost motors, including our 995 RWHP shop car turbo combo. WE run this exact spec short block, with AFR 72cc 225's, and the GM 6.0 MLS head gaskets."

POST #11
http://www.ls1tech.com/forums/showthread.php?t=590175

EDIT: Just plugged in the #s myself and im coming up with 8.637878924666251! Im gonna go nuts before i get this all together and running!


See thats what i was saying......

wether your told its ,054 or ,058 for crush thickness and 0 deck were still really close to the same and closer to 8.6-8.7-1 then 9:1
Im happy with that .. i wanted under 9:1

Kyle
NA$TY-TA is offline   Reply With Quote
Old 12-03-2006, 03:50 PM   #12
TECH Regular
 
Join Date: Aug 2005
Posts: 455
Default

How did they get these #s then? Something is wrong, he insisted that this was the right piston for me, adn told me to go check, of course i didnt go check cause he sounded so confident and posted the #s. Im gonna have to talk to them on monday.

Oops this is BBBSS i accidently posted o my buddies name. Ill update this with what i find out.
ChicagoTransAm is offline   Reply With Quote
Old 12-04-2006, 06:16 PM   #13
TECH Fanatic
Thread Starter
iTrader: (16)
 
HydroStream6's Avatar
 
Join Date: Nov 2004
Location: Rochester, NY
Posts: 1,217
Default

Good to know.. thanks guys!

My father has a 02 6.0L in his Silverado... I should swap heads with him, it'd be beneficial for both of us!
HydroStream6 is offline   Reply With Quote
Old 12-07-2006, 10:53 PM   #14
TECH Resident
iTrader: (4)
 
BIG BAD BLACKSS's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 983
Default

Can anyone confirm if this motor will be 8.7 or 9.2 compression with a 72cc head. I cant get a straight answer i keep hearing different stuff. Speed inc tells me just under 9.2, then tells me to check the math if i want and tells me what to fill in, i put those #s into the site they recommend and i get around 8.7 I sent them a PM and i get the "we use this combo for every boost motor, you can return it for a full refund if you want" again. While i appreciate them willing to still refund me after this amount of time, i still believe in their product and still want to run it. I just need to know what size head to get.
BIG BAD BLACKSS is offline   Reply With Quote
Old 12-07-2006, 11:06 PM   #15
TECH Senior Member
iTrader: (21)
 
NA$TY-TA's Avatar
 
Join Date: Aug 2002
Location: San Antonio, TX
Posts: 10,348
Default

Over and over ive had the same combo i have now and its under 9:1
NA$TY-TA is offline   Reply With Quote
Old 12-07-2006, 11:48 PM   #16
TECH Resident
iTrader: (4)
 
BIG BAD BLACKSS's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 983
Default

Ive been doing some research and using the #s speed provided and their calculator heres a chart of what compression id be at with what size chamber.

Then i have a list of heads and what size chambers they are offered in, anyone have any other heads im missing? Im assuming i can get the heads milled a littlke or have the chambers enlarged some for not too much $?? Just seeing what realistic options i have for a 9.1-9.3 compression ratio. Ive thought about running some nitrous through it so i was thinking a little more compression would be better? I keep hearing 9.0-9.5 is the sweet spot for centrifigal blowers.

62cc = 9.504
63cc= 9.409
64cc= 9.317
65cc= 9.227
66cc= 9.138
67cc= 9.053
68cc= 8.967


AFR 62cc/72cc
PATRIOT 72cc LS6 ported
STOCK LS1 67cc
EDELBROCK 65CC
PATRIOT LS6 64cc
TRICKFLOW 64cc
STOCK LS6 63cc
RHS 62cc
DART 62cc

I was hoping to use a 72cc AFR head since i had the shortblock built, looking for 9.0+ compression, but i dont see that happeneing without having to deck then a descent amount.
BIG BAD BLACKSS is offline   Reply With Quote
Old 12-08-2006, 09:27 AM   #17
Moderator
iTrader: (2)
 
FANTAZ28's Avatar
 
Join Date: Jan 2002
Location: THE CHI
Posts: 946
Default

ls1's are never at zero deck... usualy out of the hole a little...... but im not 100 percent on that.
FANTAZ28 is offline   Reply With Quote
Old 12-08-2006, 09:51 AM   #18
LS1Tech Co-Founder
iTrader: (34)
 
Pro Stock John's Avatar
 
Join Date: Nov 2001
Location: Chicago, IL
Posts: 41,946
Default

Quote:
Originally Posted by HydroStream6
I know ARP studs are definitly a good idea at this point. I'm not postive where my CR is at this point... Diamonds site lists 9.4:1 with 66cc heads, I'm not positive how the cam affects that. Anyways. as built, how much power, assuming optimal tuning, good gas, etc, can this engine hold? I'm right around 600rwhp right now and I have nitrous that I've yet to spray also.

Thanks
Adam
-Assuming 104 octane, 700-800rwhp depending on your compression.
-If you can access 70-72cc heads I'd swap over, reduces your octane requirements.

I've made 867rwhp thru an unlocked A3 with C16, not sure what I'd make on 104 unleaded.
Pro Stock John is offline   Reply With Quote
Old 12-09-2006, 10:08 AM   #19
TECH Senior Member
iTrader: (21)
 
NA$TY-TA's Avatar
 
Join Date: Aug 2002
Location: San Antonio, TX
Posts: 10,348
Default

Yeah why are you so set on above 9:1??? Most that make BIG power want lower then 9:1 because they can make MORE power with less octain, without detination.


Kyle
NA$TY-TA is offline   Reply With Quote
Old 12-11-2006, 06:16 PM   #20
TECH Resident
iTrader: (4)
 
BIG BAD BLACKSS's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 983
Default

Quote:
Originally Posted by NA$TY-TA
Yeah why are you so set on above 9:1??? Most that make BIG power want lower then 9:1 because they can make MORE power with less octain, without detination.


Kyle
I keep hearing that blowers like 9-9.5:1 And turbos are more in the 8.0-9.0 range? Have i been misled? I also want to hit it with a 100 or more shot on top of the boost, and i know nitrous likes compression. I wanted to make good power on 93 and use race fuel when spraying. Im open to new suggestions for compression.
BIG BAD BLACKSS is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Budget 383 dyno results! Couple issues... ahritchie LT1-LT4 Modifications 68 12-09-2015 10:12 AM
What kind of power can I expect out of this junkyard motor? LQ4-E39 Dyno Guesses & Bench Racing Forum 3 05-20-2015 09:38 AM
Turbo vs heads CARFREAKS Forced Induction 15 02-09-2010 02:00 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 05:28 PM.